420 SEL will not start, does not crank

[Sarjoun]

1990 420 SEL (Automatic) will not start, does not crank at all either.
I put it in neutral and tried to start it, it works. I was able to start it from Park without a problem for the next few days.

Then it would'nt start again, I'll put in neutral and allow it to roll a bit, then put it back in park and start, it works.

since yesterday the car doesn't start at all, whatever I do does'nt seem to work, could it be the starter or the crank.

Battery is good, gas pump is good, checked all the fuses. I'm just stuck.

would appreciate any help or tips.

Thanks

Sarjoun